/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayAbilitySpec.h
Version that takes an existing spec def
FGameplayAbilitySpec ( [FGameplayAbilitySpecDef](API\Plugins\GameplayAbilities\FGameplayAbilitySpecDef) & InDef, int32 InGameplayEffectLevel, [FActiveGameplayEffectHandle](API\Plugins\GameplayAbilities\FActiveGameplayEffectHandle) InGameplayEffectHandle )